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Thermal relay overload protection circuit

2016-09-27 22:05  
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Thermal relay overload protection circuit
Thermal relay overload protection circuit can be applied to avoid the failure, which is as shown. FT is the thermal relay in the string for the circuit. When motor M is overloaded, internal heating elements of FT are heated. Then the bimetal pieces bend to promote the FT’s normally closed contacts to disconnect. Thus, the AC power contactor KM coil is off. The main contact KM is off to stop the motor M. at the end, the overload failure of the winding burn can be effectively eliminated. After the overload failure being removed, Reset button of the thermal relay is pressed as well as the starting button ST. Finally, the motor can start again.